A deductive argument cannot be both valid and unsound.

All valid deductive arguments are sound arguments.

A deductive argument can be either valid or invalid and still have true premises.

In a valid deductive argument, the conclusion could be true or false.

An invalid deductive argument could have all true statements in it.

A deductive argument could have a false premise and still be sound.

All men are mortal. Ralph is a man. Therefore, Ralph is mortal.

In the past, winter has always been cold in Loei. Therefore, winter will be cold again this year.

Jason just moved here from South Africa. Michael has blond hair. Therefore, all people from South Africa have hair.